blob: 890811c53b451b40be8536db5570c23a19a6054f [file] [log] [blame]
# kbuild file for usr/ - including initramfs image and klibc
include-subdir := include
klibc-subdir := klibc
usr-subdirs := kinit utils dash gzip
subdir- := $(include-subdir) $(klibc-subdir) $(usr-subdirs)
usr-subdirs := $(addprefix _usr_,$(usr-subdirs))
klibc-subdir := $(addprefix _usr_,$(klibc-subdir))
# klibc binaries
# .initramfs_data.cpio.gz.d is used to identify all files included
# in initramfs and to detect if any files are added/removed.
# Removed files are identified by directory timestamp being updated
# The dependency list is generated by -l
ifneq ($(wildcard $(obj)/.initramfs_data.cpio.gz.d),)
include $(obj)/.initramfs_data.cpio.gz.d
# build klibc library before the klibc programs
# build klibc programs before cpio.gz
.PHONY: initramfs $(usr-subdirs) $(klibc-subdir) $(include-subdir)
initramfs: $(usr-subdirs) $(klibc-subdir) $(include-subdir)
$(deps_initramfs): $(usr-subdirs) $(klibc-subdir) $(include-subdir)
$(usr-subdirs): $(klibc-subdir)
$(Q)$(MAKE) $(klibc)=$(src)/$(patsubst _usr_%,%,$(@))
$(klibc-subdir): $(include-subdir)
$(Q)$(MAKE) $(klibc)=$(src)/$(patsubst _usr_%,%,$(@))
$(Q)$(MAKE) $(klibc)=$(src)/$(patsubst _usr_%,%,$(@))
# Generate builtin.o based on initramfs_data.o
obj-y := initramfs_data.o
# initramfs_data.o contains the initramfs_data.cpio.gz image.
# The image is included using .incbin, a dependency which is not
# tracked automatically.
$(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio.gz FORCE
# Generate the initramfs cpio archive
hostprogs-y := gen_init_cpio
ginitramfs := $(CONFIG_SHELL) $(srctree)/scripts/
ramfs-def := $(srctree)/$(src)/initramfs.default
ramfs-input := $(shell echo $(CONFIG_INITRAMFS_SOURCE))
ramfs-input := $(if $(ramfs-input), $(ramfs-input), $(ramfs-def))
ramfs-args := \
quiet_cmd_initfs = GEN $@
cmd_initfs = $(ginitramfs) -o $@ $(ramfs-args) $(ramfs-input)
targets := initramfs_data.cpio.gz
# We rebuild initramfs_data.cpio.gz if:
# 1) Any included file is newer then initramfs_data.cpio.gz
# 2) There are changes in which files are included (added or deleted)
# 3) If gen_init_cpio are newer than initramfs_data.cpio.gz
# 4) arguments to changes
$(obj)/initramfs_data.cpio.gz: $(obj)/gen_init_cpio $(deps_initramfs) initramfs
$(Q)$(ginitramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.gz.d
$(call if_changed,initfs)